The National Weather Service in Seattle recorded 103 degrees at Seattle-Tacoma International Airport, breaking a previous record of 100 degrees, set in downtown Seattle in 1941 and repeated at the airport in 1994.

The placement of the ASOS thermometer may have contributed to that high temperature record.

See this map, the red/white striped pole just left of the runway is the ASOS anemometer and wind vane mast. The temperature sensor is on the NW to SE line of dots. Airports do tend to run warmer: